Telephone connection problem?

I’m having an apparent problem with the phone connection. When I talk to people, the microphone is disconnected so that the receiver cannot hear me, but I can hear the receiver talking, and after a short time the connection is disconnected.
I think it is the signal from the telemast or the phone’s antenna, as there are no problems with telephony in my car over the internal system. I have tested the phone with call test. No problem.
The problem occurred a few months ago

Steen

There are several similar discussions and it helped to remove Mic access from Google App

Or maybe disable VoLTE

https://forum.fairphone.com/t/microphone-quality-of-the-fp4-when-using-signal-low-volume/79021/29?u=yvmuell

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